js add element at index code example
Example 1: javascript insert item into array
var colors=["red","blue"];
var index=1;
colors.splice(index, 0, "white");
Example 2: insert into array js
var list = ["hello", "world"];
list.splice( 1, 0, "bye");
["hello", "bye", "world"]
Example 3: set element at index javascript array and create new array
const items = [1, 2, 3, 4, 5]
const insert = (arr, index, newItem) => [
...arr.slice(0, index),
newItem,
...arr.slice(index)
]
const result = insert(items, 1, 10)
console.log(result)